php8.3 support

_docs/requirements.md

@@ -8,7 +8,7 @@ This information is valid only for Flyspray **1.0** or later
 ### Overview 
 
   * Web server software. We use Apache for testing, so this is the official supported. For nginx or others, look at htaccess.dist file and adapt the config for your web server.
-  * [PHP](http://php.net) 5.6 up to current PHP 8.0
+  * [PHP](http://php.net) 5.6 up to current PHP 8.3
   * PHP-GD library
   * [MySQL]([https://www.mysql.com) (and compatible variations like MariaDB) or [PostgreSQL](https://www.postgresql.org) server. MySQL 5.x (MySQL >5.5 recommended) and later and Postgresql 8.x or later are tested, older versions may or may not work, you are encouraged to report success or failures to bugs.flyspray.org or the mailing list.
   * The XML extension is *required* for Jabber (OpenSSL *recommended*) and *required* for setup and upgrades.